We sort of have a "tip shop", the shop at the top of my road is the office/shop for a small garbage trucking company. He collects things from the trash and puts them in the shop, he also attends auctions and buys the leftovers. Makes very good money at it. He told me one day that the profit from the shop covers the cost of his entire overhead!
Unfortunately much of our trash hauling has been taken over by large contract carriers and everything they pick up goes straight to the tip/landfill/dump and they DO NOT ALLOW any sort of picking, in fact you can be arrested and charged with Criminal Tresspass if you get caught taking anything from the dump.
Aaron